I vaguely recall a Heinlein novel which explored it too. Methuselah's Children maybe?

Time Enough for Love. IMHO much better than Stranger in a Strange Land.

https://en.wikipedia.org/wiki/Time_Enough_for_Love

Otherland by Tad Williams, where the powerful oligarchs of corporations are kept bodily alive bybmachinery, their mind have been transferred to a cirtual reality and they keep on going by making said virtual reality the next hypercapitalist venture.